Sundance Film Festival 2012

Castmates and rumored off-screen coupleBradley Cooper and Zoe Saldana weren't coy about their relationship status at Sundance! The costars were spotted taking their romance public, smooching at a cocktail party for their film The Words at the Park City, Utah, film festival.

"They were kissing in front of the fire and being very affectionate," an onlooker tells us of the pair, who so far have been silent about their budding romance. Adds a source: "They are definitely very together."

Another onlooker at the party says that the pair were caught in an intense conversation and were giggling, with Saldana touching Cooper's arm as he told a story before they retreated to a couch together. Adds the onlooker: "They were like two seventh graders. The electricity was out of this world."

The night before their PDA-filled party at Montage Deer Valley, the two attended an Acura-hosted premiere dinner together. The private party drew about 50 people, just castmembers and close friends of the actors, and Saldana and Cooper were spotted interacting with everyone at the dinner. Everyone was laughing a lot, a source says, and people were dancing as a deejay spun tunes. – Jennifer Garcia and Elizabeth Leonard

Kirsten Dunst wasn't shy with the PDA with new beau Garrett Hedlund at the Sundance Film Festival. The two were kissing and hugging at a dinner for Dunst's new movie, The Bachelorette, hosted by Joico and Simple House. The couple danced the night away with friends and fellow attendees, including Will Ferrell, who is one of the comedy's producers, Justin Long and Rashida Jones.

According to a partygoer at the WireImage tent, where the intimate dinner for 40 guests took place, Hedlund didn't really leave his girlfriend's side after the two made their late arrival. They also toasted to the film together.

Adds a source: "Kirsten and Garrett have been spending time together since the holidays. They were friends on the set of On the Road, and now they've grown closer. They spent Christmas together and he feels very strongly about her." – Jennifer Garcia and Dahvi Shira